Hmmm. I was travelling for a business meeting, not invading the highlands
You can decide to sit in a Ninja like state of alert taking in avery blade of grass and crack in the road if you wish - although this will induce fatigue and stress IMHO.
Or you can relax, leave yourself enough room and listen to the radio (music or speech) and take the stress away from the journey, and giving you enough time and space to cope with mad repmobiles in a hurry, dozy locals who don't need to indicate, trucks, more trucks and the mad rush in the overtaking zones.
Whatever works for you - safety is the most important factor.